Vibrio parahaemolyticus Associated with Mass Mortality of Postlarval Abalone, Haliotis diversicolor supertexta (L.), in Sanya, China

文献类型： 外文期刊

第一作者： Cai, Junpeng

作者： Cai, Junpeng;Cheng, Lu;Huang, Jie;Shi, Chengyin;Thompson, Kim D.;Mackey, Bernard

作者机构：

关键词： mass mortality;postfertilization

期刊名称：JOURNAL OF THE WORLD AQUACULTURE SOCIETY （ 影响因子：2.512； 五年影响因子：2.47 ）

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收录情况： SCI

摘要： Outbreaks of mass mortality in postlarval abalone, Haliotis diversicolor supertexta (L.), have swept across south China since 2002 and in turn have resulted in many abalone farms closing. Twenty-five representative bacterial isolates were isolated from a sample of five diseased postlarval abalone, taken 15 d postfertilization during an outbreak of postlarval disease in Sanya, Hainan Province, China in October 2004. A dominant isolate, referred to as Strain 6, was found to be highly virulent to postlarvae in an experimental challenge test, with a 50% lethal dose (LD50) value of 3.2 x 10(4) colony forming units (CFU)/mL, while six of the other isolates were weakly virulent with LD50 values ranging from 1 x 10(6) to 1 x 10(7) CFU/mL, and the remaining 18 isolates were classified as avirulent with LD50 values greater than 1 x 10(8) CFU/mL. Using both an API 20E kit and 16S recombinant DNA sequence analysis, Strain 6 was shown to be Vibrio parahaemolyticus. It was sensitive to 4 and intermediately sensitive to 5 of the 16 antibiotics used when screening the antibiotic sensitivities of the bacterium. Extracellular products (ECPs) prepared from the bacterium were lethal to postlarvae when used in a toxicity test at a concentration of 3.77 mg protein/mL, and complete liquefaction of postlarvae tissues occurred within 24 h postexposure. Results from this study implicate V. parahaemolyticus as the pathogen involved in the disease outbreaks in postlarval abalone in Sanya and show that the ECPs may be involved in the pathogenesis of the disease.

分类号： S9

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